def test_downvote_below_zero_raises_exception(self):
rager = Performance("Nathan Trinkl's Birthday Bash",
datetime.datetime(18, 3, 16, 9, 55))
anant = Performer("Anant Sahai", 94704, "I reenact animes.")
rager.register(anant)
with self.assertRaises(ValueError):
rager.downvote(anant)
def test_downvote_decrements_num_votes(self):
rager = Performance("Nathan Trinkl's Birthday Bash",
datetime.datetime(18, 3, 16, 9, 55))
anant = Performer("Anant Sahai", 94704, "I reenact animes.")
anant.apply_to(rager)
rager.approve(anant)
self.assertEqual(rager.num_votes(anant), 0)
rager.upvote(anant)
self.assertEqual(rager.num_votes(anant), 1)
rager.downvote(anant)
self.assertEqual(rager.num_votes(anant), 0)